Overall meaning : Allah Almighty states that the Muslims from the nation of Muhammad, may Allah bless him and grant him peace, the Jews before the abrogation of their religion, the Sabaeans who followed no particular religion or sect, worshipped Allah alone and avoided injustice and immorality among other forms of vice, and the Christians before the abrogation of their religions—all these four groups who truly and sincerely believe in Allah and the Last Day and do good deeds will have nothing whatsoever to fear in the hereafter, nor will they grieve for whatever they leave behind in the life of the world.
The Almighty then mentions the solemn covenant He made with the Children of Israel, whereby they obliged and bound themselves to believe in Him and obey His commandments, stating that He sent them messengers one after the other to remind them of their obligations. But whenever a messenger came to them with a message that did not suit their desires, they broke their covenants: they accused some of these messengers of lying and killed others.
They thought there would be no punishment or dire consequences a result of what they had done, and so they continued in their transgressions and became blind and deaf to the truth. Then Allah forgave them after guiding them to turn to Him in repentance. Then again many of them relapsed to their former evil ways and plunged again into sin and error and yet again became blind and deaf to the truth. Allah is fully aware of their actions and he will repay them according to their works.